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The vapor-liquid equilibrium behavior of a binary mixture of chloroform and acetone at 760 mmHg can be obtained using the Wilson model and a modification of Raoult's law. This mixture exhibits a maximum boiling azeotrope, whose composition is 66.13% chloroform mole fraction. The simple distillation residue curve is the solution of the following differential-algebraic equation: ... , ... , and ... , where ... is the warped time, ... is the chloroform mole fraction in the still at ... , ... is the equilibrium constant, and ... is the initial ethanol composition in the still. Since a negative azeotrope exists for this mixture, the still has the azeotropic composition for large ... (i.e., ... ), independent of the initial composition in the still.
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